Superconductivity

Mahan, G. D.

doi:10.1007/978-1-4613-1469-1_9

Cited by 21 publications

(29 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here, n def is the homogeneous defect density of the sample, which we treat as an intrinsic parameter of the sample material. Following the straightforward calculations outlined by Mahan et al and Girvin et al, the defect scattering rate is then proportional to N def V 0 2 and the density of states. With the above approximations, one obtains Γ dis = α L 2 , where the proportionality constant α includes only the intrinsic parameters of the sample which do not vary from spot to spot.…”

mentioning

confidence: 99%

Ultrafast Nanoimaging of Electronic Coherence of Monolayer WSe₂

et al. 2023

View full text Add to dashboard Cite

Transition-metal dichalcogenides (TMDs) have demonstrated a wide range of novel photonic, optoelectronic, and correlated electron phenomena for more than a decade. However, the coherent dynamics of their excitons, including possibly long dephasing times and their sensitivity to spatial heterogeneities, are still poorly understood. Here we implement adiabatic plasmonic nanofocused fourwave mixing (FWM) to image the coherent electron dynamics in monolayer WSe 2 . We observe nanoscale heterogeneities at room temperature with dephasing ranging from T 2 ≲ 5 to T 2 ≳ 60 fs on length scales of 50−100 nm. We further observe a counterintuitive anticorrelation between FWM intensity and T 2 , with the weakest FWM emission at locations of longest coherence. We interpret this behavior as a nonlocal nano-optical interplay between spatial coherence of the nonlinear polarization and disorder-induced scattering. The results highlight the challenges associated with heterogeneities in TMDs limiting their photophysical properties, yet also the potential of their novel nonlinear optical phenomena.

show abstract

mentioning

confidence: 99%

Ultrafast Nanoimaging of Electronic Coherence of Monolayer WSe₂

et al. 2023

View full text Add to dashboard Cite

show abstract

“…RPA is a nonlocal correlation energy functional, and thus the RPA-derived polarizability captures the nonlocal optical response driven by both interband and intraband electronic transitions. 66 However, RPA may come with a high computational cost and may suffer from convergence issues and instabilities. 67 Instead, well-known, semiclassical Drude models are often used to describe longitudinal polarizability.…”

Section: Quasi-classical Description Of Plasmon Fizeau Drag In Dsms A...mentioning

confidence: 99%

Plasmon Fizeau Drag in 3D Dirac and Weyl Semimetals

Blevins,

Boriskina

2024

ACS Photonics

View full text Add to dashboard Cite

There is a need for compact, dynamically tunable, nonreciprocal optical elements to enable on-chip-compatible optical isolators and more efficient radiative energy transfer systems. Plasmon Fizeau drag, the drag of an electrical current on propagating surface plasmon polaritons (SPPs), has been proposed to induce nonreciprocal surface modes to enable one-way energy transport. However, relativistic electron drift velocities are required to induce an appreciable contrast between the dispersion characteristics of copropagating and counter-propagating surface plasmon modes. The high electron drift velocity of graphene previously allowed for the experimental demonstration of current-induced nonreciprocity in a two-dimensional (2D) Dirac material. The high electron drift and Fermi velocities in three-dimensional (3D) Dirac materials make them ideal candidates for the effect; however, both the theory of the Fizeau drag effect and its experimental demonstrations in 3D Dirac materials are missing. Here, we develop a comprehensive theory of Fizeau drag in DC-biased 3D Weyl semimetals (WSMs) or Dirac semimetals (DSMs), both under local and nonlocal approximation and with dissipative losses. We predict that under practical assumptions for loss, Fizeau drag in the DSM Cd3As2 opens windows of pseudounidirectional transport. We additionally introduce new figures of merit to rank nonreciprocal plasmonic systems by their potential for directional SPP transport. Further, we propose a new approach for achieving appreciable plasmonic Fizeau drag via optically pumping bulk inversion symmetry-breaking WSMs or DSMs.

show abstract

“…Typically, the density is obtained from the Kohn−Sham equations 7 with an approximate exchange− correlation (xc) potential, and the GF, from a Dyson equation with an approximate xc self-energy Σ xc . 8 It is therefore not always obvious which framework [density functional theory (DFT), GF functional theory, etc.] is the best choice to access a given observable.…”

Section: Introductionmentioning

confidence: 99%

Total Energy beyond GW: Exact Results and Guidelines for Approximations

El-Sahili,

Sottile,

Reining

2024

J. Chem. Theory Comput.

View full text Add to dashboard Cite

The total energy and electron addition and removal spectra can, in principle, be obtained exactly from the one-body Green’s function (GF). In practice, the GF is obtained from an approximate self-energy. In the framework of many-body perturbation theory, we derive different expressions that are based on an approximate self-energy, but that yield nevertheless, in principle, the exact exchange–correlation contribution to the total energy for any interaction strength. Response functions play a crucial role, which explains why, for example, ingredients from time-dependent density functional theory can be used to build these approximate self-energies. We show that the key requirement for obtaining exact results is the consistent combination of ingredients. Also when further approximations are made, as it is necessary in practice, this consistency remains the key to obtain good results. All findings are illustrated using the exactly solvable symmetric Hubbard dimer.

show abstract

Superconductivity

Cited by 21 publications

References 34 publications

Ultrafast Nanoimaging of Electronic Coherence of Monolayer WSe₂

Ultrafast Nanoimaging of Electronic Coherence of Monolayer WSe₂

Plasmon Fizeau Drag in 3D Dirac and Weyl Semimetals

Total Energy beyond GW: Exact Results and Guidelines for Approximations

Contact Info

Product

Resources

About

Superconductivity

Cited by 21 publications

References 34 publications

Ultrafast Nanoimaging of Electronic Coherence of Monolayer WSe2

Ultrafast Nanoimaging of Electronic Coherence of Monolayer WSe2

Plasmon Fizeau Drag in 3D Dirac and Weyl Semimetals

Total Energy beyond GW: Exact Results and Guidelines for Approximations

Contact Info

Product

Resources

About

Ultrafast Nanoimaging of Electronic Coherence of Monolayer WSe₂

Ultrafast Nanoimaging of Electronic Coherence of Monolayer WSe₂